Package: libqt5core5a Version: 5.12.5+dfsg-8 Severity: normal The latest version of libqt5core5a breaks libqtcore4 (< 4:4.8.7+dfsg-20~), which is any libqtcore4 version currently available in unstable. Is this intentional? This makes libqt5core5a uninstallable for me. I have several programs which still depend on libqtcore4. I also still develop on qt4.